Arp's Catalog of Peculiar Galaxies - Provides images from the catalog of 338 peculiar galaxy views gathered by Dr. Halton C. Arp in his Atlas of Peculiar Galaxies.

Astronomical Sketches - Sketches of astronomical objects made at the telescope by M. Geldorp.

Astronomy Made Easy - Gear, autostar, astrophotos, LXD55 care, and links.

A CCD Tour of the Universe - Includes deep sky objects and solar system CCD galleries, techniques and resources, and equipment.

Challenging Observing Projects for Amateur Astronomers - Includes 100 peculiar galaxies, off the beaten path, observing galaxy clusters, the Abell planetaries, and the ultimate observing list with images.

Deep Sky Collections and Catalogs - Links and observing lists.

Deep Sky Intro - Article on various types of deep sky objects.

Deep Sky Observing - Deep sky object types and classifications. Includes a Messier interactive map, pictures, constellations and observation guide.

Deepsky Observer's Companion - Tutorials, chart index, discussions, certificates, and resources.

Deepsky Observer's Companion - Tutorials, chart index, discussions, certificates, and resources.

DeepSkyPedia - Wiki project aiming to help amateur astronomers in planning their observing sessions. Includes more than 4,000 articles describing the appearance of various deep sky objects in instruments of all sizes.

Drawings of Astronomical Objects - Collection of deep-sky and solar system objects.

Graphite Galaxy - Astronomical sketches of deep sky objects observed by Ferenc Lovro.

Ian's Astro Page - Sketches, scratchings, pictures, and links, and construction of piggyback camera adaptor.

Iiro's DeepSky Sketches - A collection of my deepsky sketches and general information about deepsky objects and telesopes.

List of Common Deep Sky Catalogs - General, supernova remnants, planetary nebulae, diffuse nebulae, dark nebulae, open clusters, globular clusters, galaxies, clusters of galaxies, double stars, and references.

Messier45 - Observing guide, articles, Messier Gallery, Herschel 400 and Deep Sky Browser which allows the ability to search deep sky objects and view maps and images of over 600,000 objects.

The Messier Catalog - Images and galleries, marathoner list, and new nebula and supernovae.

The National Deep Sky Observers Society - Contains information, challenges, galaxy clusters, globular clusters, open star clusters, naked eye observations, observing planetary nebulae, the Milky Way, and star hopping.

NetAstro Catalog - The Internet Amateur Astronomers Catalog (IAAC), a mailing list for deep sky observers of all levels.

Ray Cash's Deep-Sky Page - Articles, information, photos, and links about deep-sky observing.

The Searchable Universe - Celestial object catalogs providing links to information.

Secrets of Deep-Sky Observing - Pointers observers should know includes sky brightness, dark adaptation, averted vision, high power, capturing color, and other tips.

Star Observer - Math Heijen provides a collection of visual observing reports on stars, double stars and open clusters.

View-tah's Astronomy Pages - Deep Sky - Information, images, charts for the Messier, Caldwell, NGC, and Hubble with search tool.

Visual Deep Sky Observing - Galleries of sketches, legend, projects, publications, and links.

The Webb Deep-Sky Society - International society of amateur and professional astronomers specializing in the observation of deep sky objects. Includes a forum where members can communicate and publish the results of their observations.